LIGNIN STRUCTUTAL VARIATION IN HARDWOOD SPECIES
A comprehensive lignin structure analysis of ten industrially relevant hardwood species (E. urograndis, E. niten, E. globulus, sweet gum, red maple, red oak, birch, red alder, cottonwood, and Acacia mangum) was performed and loblolly pine was used as a softwood reference. Milled wood lignin (MWL) was isolated from each species by a modified protocol. All MWL preparations were analyzed through quantitative 13C NMR spectroscopy, ozonolysis, and nitrobenzene oxidation. A new method to determine the S/G ratio of total lignin in wood was developed, using a calibration line established by the S/V ratio (nitrobenzene oxidation) and the S/G ratio (13C NMR) of MWL. Significant variations in lignin structures (S/G ratio, β-O-4, degree of condensation, elemental and methoxyl contents, etc.) were found among the hardwood species studied. However, these structural variations among species appear to be controlled by a single factor, the S/G ratio.
S/G S/V lignin hardwoods and 13C NMR
Ricardo B. Santos Ewellyn A. Capanema Mikhail Yu. Balakshin Hou-min Chang Hasan Jameel
Department of Forest Biomaterials, North Carolina State University, NC 27606, USA Department of Forest Biomaterials, North Carolina State University, NC 27606, USA Lignol Innovations
国际会议
16th International Symposium on Wood,Fiber and Pulping Chemistry(第十六届木材、纤维及制浆化学国际会议)
天津
英文
337-342
2011-06-08（万方平台首次上网日期，不代表论文的发表时间）